I'm not sure I agree with that. This information was discovered at a Truce meeting regarding the S9 who were already in the city and had already revealed themselves. It's less that she didn't push on it and was more focused on the pending localized apolypse that the S9 tended to leave in their wake. Also, we don't see her perspective or thoughts. For all we know after that meeting, Militia was constantly thinking or trying to do something about it.
You must not have read Ward, or really paid close attention in Worm. The fanon cool Miss Militia went the way of most characters in ward. Functionally useless, but also just the most basic bitch yes man. Also, did you ever really read the scene where Calvert tells them he has Dinah? This motherfucker, and he was known as a motherfucker at that point, point blank tells them all, including Miss Militia, that yes he's kidnapped the girl but it was for her own good because she had power problems and that she's happy with him and doesn't want to leave. No, you may not see her or talk to her to confirm this. Parents and family, and remember she had important extended family, weren't even mentioned. And she wasn't the only one to just go along with it, but she was right there and she did not make even a token protest. That the kind of heel turn that, in most works, would mark the character as a huuuuge piece of shit.
And the fandom mostly didn't read that and is all 'Miss Militia is one of the good ones, she just works within the system. Come on and meet cute with Danny, be Taylor's new mom!'
But just like so many other 'one of the good ones', she's an enabler to the systemic abuses, corruption, covers other bad apples, and occasionally is an active participant to sheer fucking apathetic evil. Because if she WAS one of the good ones, she wouldn't be a protectorant cape high up in the hierarchy.
Don't get me wrong, I like fanon Miss Militia. I think that's how she should be. But CANON Miss Militia is a callow, punch clock cop who does not give shit about anything she's not forced to.
Look at how she backed up Alexandria a week after Alexandria was revealed to be a huge fucking part of the corruption, practically a serial extra judicial murderer but who took time out of her busy schedule to come traumatize a teenage girl, who, yes, was a warlord, but the way she did it, and the fact that she was allowed to show up and order people around.... Shit man. But even ignoring that, Miss Militia backed her to the fucking hilt.
Consider this scene.
"Why?" Miss Militia asked. "What changed your mind from the moment you decided to surrender? Your friends weren't at risk, you already knew something about Tagg and Alexandria."
"You," I told her. "You were part of it."
"I didn't do anything."
"Exactly."
"You can't blame me for standing out of the way. You had a plan, Alexandria told me she had a plan, and nobody shared anything substantial with me. I couldn't take a step without risking that I'd get in someone's way."
A good person with basic fucking decency would not have done nothing.
And in Ward, she's just as bad if not worse. Shes part of a delegation of capes sent as diplomats to a world that rather notably hates capes, bringing several minors. Miss Militia invited Breakthrough to help her as diplomats and then walked off looking sad when they got hauled away to be tortured--yes, including the eleven year old--and told them to handle it themselves.
Tldr Miss Militia a
shit.